From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B94BCC433E0 for ; Thu, 2 Jul 2020 01:34:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8CE5D20748 for ; Thu, 2 Jul 2020 01:34:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593653683; bh=30HkcgXNjv8HHhen8WTqMInBwSDwJ9xryGRUgIxvElU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EFsRlDv7s6wmaHzbBVzeiqyRCl0daqM2CLYCeo75r13p/xfGNxmYEK8B7BsR238b8 PNbV/FZJdNChe9WjpX603k/oYDYGRA3wKzz763lQ+b4bi/8CAXAojnfywTnIR0ictO VApyUMJ5MZ4X1ft7RogEoVkJYPPTvh8t/8zMcfWo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729287AbgGBBem (ORCPT ); Wed, 1 Jul 2020 21:34:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:56388 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728189AbgGBBZa (ORCPT ); Wed, 1 Jul 2020 21:25:30 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E184D2145D; Thu, 2 Jul 2020 01:25:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593653129; bh=30HkcgXNjv8HHhen8WTqMInBwSDwJ9xryGRUgIxvElU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Gt2ZFrhGiR0G0khkKOEcNY6lCs7D69XLdOEK2r1XRdbhtik0gZkTuPFlA00Ib6yWo Q21oCUy4iaPicit5ge0/0OEnxy73W3g7FqxFZxP/tvgmgrLy9swZ7KWZRfy/qzh3E/ w+gx2GmFcvOKjcmsx4mGJJLM7xdhiqp6mbsPuIwI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Tony Lindgren , maemo-leste@lists.dyne.org, Merlijn Wajer , Pavel Machek , Sebastian Reichel , Sasha Levin , devicetree@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 04/40] ARM: dts: omap4-droid4: Fix spi configuration and increase rate Date: Wed, 1 Jul 2020 21:23:25 -0400 Message-Id: <20200702012402.2701121-4-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200702012402.2701121-1-sashal@kernel.org> References: <20200702012402.2701121-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tony Lindgren [ Upstream commit 0df12a01f4857495816b05f048c4c31439446e35 ] We can currently sometimes get "RXS timed out" errors and "EOT timed out" errors with spi transfers. These errors can be made easy to reproduce by reading the cpcap iio values in a loop while keeping the CPUs busy by also reading /dev/urandom. The "RXS timed out" errors we can fix by adding spi-cpol and spi-cpha in addition to the spi-cs-high property we already have. The "EOT timed out" errors we can fix by increasing the spi clock rate to 9.6 MHz. Looks similar MC13783 PMIC says it works at spi clock rates up to 20 MHz, so let's assume we can pick any rate up to 20 MHz also for cpcap. Cc: maemo-leste@lists.dyne.org Cc: Merlijn Wajer Cc: Pavel Machek Cc: Sebastian Reichel Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi index 82f7ae030600d..ab91c4ebb1463 100644 --- a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi +++ b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi @@ -13,8 +13,10 @@ cpcap: pmic@0 { #interrupt-cells = <2>; #address-cells = <1>; #size-cells = <0>; - spi-max-frequency = <3000000>; + spi-max-frequency = <9600000>; spi-cs-high; + spi-cpol; + spi-cpha; cpcap_adc: adc { compatible = "motorola,mapphone-cpcap-adc"; -- 2.25.1